{"id":6907,"date":"2014-04-21T20:36:37","date_gmt":"2014-04-21T18:36:37","guid":{"rendered":"http:\/\/tronic.fr\/maitronaute\/?page_id=6907"},"modified":"2014-05-19T18:37:03","modified_gmt":"2014-05-19T16:37:03","slug":"constellation","status":"publish","type":"page","link":"https:\/\/saturna.fr\/maitronaute\/astronomie\/lunivers\/constellation\/","title":{"rendered":"Constellation"},"content":{"rendered":"<p><a href=\"http:\/\/tronic.fr\/blog\/wp-content\/uploads\/2014\/02\/etoiles_lts_copy.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-6864 alignright\" src=\"http:\/\/tronic.fr\/blog\/wp-content\/uploads\/2014\/02\/etoiles_lts_copy-700x437.jpg\" alt=\"etoiles_lts_copy\" width=\"420\" height=\"262\" \/><\/a><\/p>\n<p>Une constellation est un groupe d&rsquo;\u00e9toiles qui, vues de la Terre, forment une figure imaginaire \u00e0 laquelle on donne un nom.<\/p>\n<p>Exemples : <a href=\"http:\/\/fr.wikipedia.org\/wiki\/Grande_Ourse\" target=\"_blank\"><strong>la Grande Ourse<\/strong><\/a>, <span style=\"color: #ff6600;\"><strong>la Petite Ourse<\/strong><\/span>,<strong><span style=\"color: #ff6600;\"> Orion<\/span><\/strong>,<span style=\"color: #ff6600;\"><strong> le Cancer<\/strong><\/span>, <span style=\"color: #ff6600;\"><strong>les G\u00e9meaux<\/strong><\/span>,<strong><span style=\"color: #ff6600;\"> le Lion<\/span><\/strong>&#8230;<\/p>\n<p>Les noms des constellations de l&rsquo;h\u00e9misph\u00e8re nord proviennent de la Gr\u00e8ce antique.<\/p>\n<p>Aujourd&rsquo;hui, un total de 88 constellations a \u00e9t\u00e9 adopt\u00e9 par l&rsquo;<a title=\"Union astronomique internationale\" href=\"http:\/\/tronic.fr\/blog\/index.php\/astronomie\/lexique\/\">Union astronomique internationale<\/a> (UAI). Pr\u00e8s de la moiti\u00e9 proviennent des astronomes grecs.<\/p>\n<p>Quand on regarde le ciel, on a l&rsquo;impression que toutes les \u00e9toiles sont \u00e0 la m\u00eame distance par rapport \u00e0 nous. Il n&rsquo;en est rien ; <span style=\"color: #ff6600;\"><strong>les \u00e9toiles d&rsquo;une constellation sont le plus souvent \u00e0 des distances tr\u00e8s diff\u00e9rentes<\/strong><\/span>.<\/p>\n<p>Un exemple avec<em> la constellation de la Grande Ourse (Ursa Major)<\/em> ; voici la liste des \u00e9toiles et leur distance par rapport \u00e0 nous, en ann\u00e9es-lumi\u00e8re (al) :<\/p>\n<ul>\n<li>Alioth : 81 al<\/li>\n<li>Dubhe : 124 al<\/li>\n<li>Mizar : 78 al<\/li>\n<li>Alkaid : 101 al<\/li>\n<li>Merak : 79 al<\/li>\n<li>Megrez : 81 al<\/li>\n<li>Phekha : 84 al<\/li>\n<\/ul>\n<p><a href=\"http:\/\/tronic.fr\/blog\/wp-content\/uploads\/2014\/02\/etoile_polaire.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6933\" src=\"http:\/\/tronic.fr\/blog\/wp-content\/uploads\/2014\/02\/etoile_polaire.jpg\" alt=\"etoile_polaire\" width=\"400\" height=\"334\" \/><\/a> <a href=\"http:\/\/tronic.fr\/blog\/wp-content\/uploads\/2014\/02\/constellations_distance_etoiles_schema.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-6935\" src=\"http:\/\/tronic.fr\/blog\/wp-content\/uploads\/2014\/02\/constellations_distance_etoiles_schema-700x397.png\" alt=\"constellations_distance_etoiles_schema\" width=\"700\" height=\"397\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une constellation est un groupe d&rsquo;\u00e9toiles qui, vues de la Terre, forment une figure imaginaire \u00e0 laquelle on donne un nom. Exemples : la Grande Ourse, la Petite Ourse, Orion, le Cancer, les G\u00e9meaux,&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":6902,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-6907","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/pages\/6907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/comments?post=6907"}],"version-history":[{"count":2,"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/pages\/6907\/revisions"}],"predecessor-version":[{"id":7372,"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/pages\/6907\/revisions\/7372"}],"up":[{"embeddable":true,"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/pages\/6902"}],"wp:attachment":[{"href":"https:\/\/saturna.fr\/maitronaute\/wp-json\/wp\/v2\/media?parent=6907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}